diff options
Diffstat (limited to 'drivers/infiniband/sw/rdmavt/qp.c')
-rw-r--r-- | drivers/infiniband/sw/rdmavt/qp.c | 276 |
1 files changed, 113 insertions, 163 deletions
diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c index 7858d499db03..3acab569fbb9 100644 --- a/drivers/infiniband/sw/rdmavt/qp.c +++ b/drivers/infiniband/sw/rdmavt/qp.c @@ -1,48 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause /* - * Copyright(c) 2016 - 2019 Intel Corporation. - * - * This file is provided under a dual BSD/GPLv2 license. When using or - * redistributing this file, you may do so under either license. - * - * GPL LICENSE SUMMARY - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * BSD LICENSE - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * - Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - Neither the name of Intel Corporation nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * + * Copyright(c) 2016 - 2020 Intel Corporation. */ #include <linux/hash.h> @@ -156,7 +114,7 @@ void rvt_wss_exit(struct rvt_dev_info *rdi) rdi->wss = NULL; } -/** +/* * rvt_wss_init - Init wss data structures * * Return: 0 on success @@ -323,6 +281,7 @@ static void get_map_page(struct rvt_qpn_table *qpt, /** * init_qpn_table - initialize the QP number table for a device + * @rdi: rvt dev struct * @qpt: the QPN table */ static int init_qpn_table(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt) @@ -524,16 +483,20 @@ static inline unsigned mk_qpn(struct rvt_qpn_table *qpt, * IB_QPT_SMI/IB_QPT_GSI * @rdi: rvt device info structure * @qpt: queue pair number table pointer + * @type: the QP type * @port_num: IB port number, 1 based, comes from core + * @exclude_prefix: prefix of special queue pair number being allocated * * Return: The queue pair number */ static int alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt, - enum ib_qp_type type, u8 port_num) + enum ib_qp_type type, u8 port_num, u8 exclude_prefix) { u32 i, offset, max_scan, qpn; struct rvt_qpn_map *map; u32 ret; + u32 max_qpn = exclude_prefix == RVT_AIP_QP_PREFIX ? + RVT_AIP_QPN_MAX : RVT_QPN_MAX; if (rdi->driver_f.alloc_qpn) return rdi->driver_f.alloc_qpn(rdi, qpt, type, port_num); @@ -553,7 +516,7 @@ static int alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt, } qpn = qpt->last + qpt->incr; - if (qpn >= RVT_QPN_MAX) + if (qpn >= max_qpn) qpn = qpt->incr | ((qpt->last & 1) ^ 1); /* offset carries bit 0 */ offset = qpn & RVT_BITS_PER_PAGE_MASK; @@ -652,8 +615,8 @@ static void rvt_clear_mr_refs(struct rvt_qp *qp, int clr_sends) /** * rvt_swqe_has_lkey - return true if lkey is used by swqe - * @wqe - the send wqe - * @lkey - the lkey + * @wqe: the send wqe + * @lkey: the lkey * * Test the swqe for using lkey */ @@ -672,8 +635,8 @@ static bool rvt_swqe_has_lkey(struct rvt_swqe *wqe, u32 lkey) /** * rvt_qp_sends_has_lkey - return true is qp sends use lkey - * @qp - the rvt_qp - * @lkey - the lkey + * @qp: the rvt_qp + * @lkey: the lkey */ static bool rvt_qp_sends_has_lkey(struct rvt_qp *qp, u32 lkey) { @@ -696,8 +659,8 @@ static bool rvt_qp_sends_has_lkey(struct rvt_qp *qp, u32 lkey) /** * rvt_qp_acks_has_lkey - return true if acks have lkey - * @qp - the qp - * @lkey - the lkey + * @qp: the qp + * @lkey: the lkey */ static bool rvt_qp_acks_has_lkey(struct rvt_qp *qp, u32 lkey) { @@ -713,10 +676,10 @@ static bool rvt_qp_acks_has_lkey(struct rvt_qp *qp, u32 lkey) return false; } -/* +/** * rvt_qp_mr_clean - clean up remote ops for lkey - * @qp - the qp - * @lkey - the lkey that is being de-registered + * @qp: the qp + * @lkey: the lkey that is being de-registered * * This routine checks if the lkey is being used by * the qp. @@ -850,6 +813,7 @@ bail: /** * rvt_init_qp - initialize the QP state to the reset state + * @rdi: rvt dev struct * @qp: the QP to init or reinit * @type: the QP type * @@ -898,14 +862,13 @@ static void rvt_init_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, qp->s_tail_ack_queue = 0; qp->s_acked_ack_queue = 0; qp->s_num_rd_atomic = 0; - if (qp->r_rq.kwq) - qp->r_rq.kwq->count = qp->r_rq.size; qp->r_sge.num_sge = 0; atomic_set(&qp->s_reserved_used, 0); } /** * _rvt_reset_qp - initialize the QP state to the reset state + * @rdi: rvt dev struct * @qp: the QP to reset * @type: the QP type * @@ -979,7 +942,8 @@ static void rvt_reset_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, spin_unlock_irq(&qp->r_lock); } -/** rvt_free_qpn - Free a qpn from the bit map +/** + * rvt_free_qpn - Free a qpn from the bit map * @qpt: QP table * @qpn: queue pair number to free */ @@ -987,6 +951,9 @@ static void rvt_free_qpn(struct rvt_qpn_table *qpt, u32 qpn) { struct rvt_qpn_map *map; + if ((qpn & RVT_AIP_QP_PREFIX_MASK) == RVT_AIP_QP_BASE) + qpn &= RVT_AIP_QP_SUFFIX; + map = qpt->map + (qpn & RVT_QPN_MASK) / RVT_BITS_PER_PAGE; if (map->page) clear_bit(qpn & RVT_BITS_PER_PAGE_MASK, map->page); @@ -1049,7 +1016,7 @@ static int alloc_ud_wq_attr(struct rvt_qp *qp, int node) /** * rvt_create_qp - create a queue pair for a device - * @ibpd: the protection domain who's device we create the queue pair for + * @ibqp: the queue pair * @init_attr: the attributes of the queue pair * @udata: user data for libibverbs.so * @@ -1057,44 +1024,45 @@ static int alloc_ud_wq_attr(struct rvt_qp *qp, int node) * unique idea of what queue pair numbers mean. For instance there is a reserved * range for PSM. * - * Return: the queue pair on success, otherwise returns an errno. + * Return: 0 on success, otherwise returns an errno. * * Called by the ib_create_qp() core verbs function. */ -struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, - struct ib_qp_init_attr *init_attr, - struct ib_udata *udata) +int rvt_create_qp(struct ib_qp *ibqp, struct ib_qp_init_attr *init_attr, + struct ib_udata *udata) { - struct rvt_qp *qp; - int err; + struct rvt_qp *qp = ibqp_to_rvtqp(ibqp); + int ret = -ENOMEM; struct rvt_swqe *swq = NULL; size_t sz; - size_t sg_list_sz; - struct ib_qp *ret = ERR_PTR(-ENOMEM); - struct rvt_dev_info *rdi = ib_to_rvt(ibpd->device); + size_t sg_list_sz = 0; + struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device); void *priv = NULL; size_t sqsize; + u8 exclude_prefix = 0; if (!rdi) - return ERR_PTR(-EINVAL); + return -EINVAL; + + if (init_attr->create_flags & ~IB_QP_CREATE_NETDEV_USE) + return -EOPNOTSUPP; if (init_attr->cap.max_send_sge > rdi->dparms.props.max_send_sge || - init_attr->cap.max_send_wr > rdi->dparms.props.max_qp_wr || - init_attr->create_flags) - return ERR_PTR(-EINVAL); + init_attr->cap.max_send_wr > rdi->dparms.props.max_qp_wr) + return -EINVAL; /* Check receive queue parameters if no SRQ is specified. */ if (!init_attr->srq) { if (init_attr->cap.max_recv_sge > rdi->dparms.props.max_recv_sge || init_attr->cap.max_recv_wr > rdi->dparms.props.max_qp_wr) - return ERR_PTR(-EINVAL); + return -EINVAL; if (init_attr->cap.max_send_sge + init_attr->cap.max_send_wr + init_attr->cap.max_recv_sge + init_attr->cap.max_recv_wr == 0) - return ERR_PTR(-EINVAL); + return -EINVAL; } sqsize = init_attr->cap.max_send_wr + 1 + @@ -1103,19 +1071,17 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, case IB_QPT_SMI: case IB_QPT_GSI: if (init_attr->port_num == 0 || - init_attr->port_num > ibpd->device->phys_port_cnt) - return ERR_PTR(-EINVAL); - /* fall through */ + init_attr->port_num > ibqp->device->phys_port_cnt) + return -EINVAL; + fallthrough; case IB_QPT_UC: case IB_QPT_RC: case IB_QPT_UD: sz = struct_size(swq, sg_list, init_attr->cap.max_send_sge); swq = vzalloc_node(array_size(sz, sqsize), rdi->dparms.node); if (!swq) - return ERR_PTR(-ENOMEM); + return -ENOMEM; - sz = sizeof(*qp); - sg_list_sz = 0; if (init_attr->srq) { struct rvt_srq *srq = ibsrq_to_rvtsrq(init_attr->srq); @@ -1125,10 +1091,10 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, } else if (init_attr->cap.max_recv_sge > 1) sg_list_sz = sizeof(*qp->r_sg_list) * (init_attr->cap.max_recv_sge - 1); - qp = kzalloc_node(sz + sg_list_sz, GFP_KERNEL, - rdi->dparms.node); - if (!qp) - goto bail_swq; + qp->r_sg_list = + kzalloc_node(sg_list_sz, GFP_KERNEL, rdi->dparms.node); + if (!qp->r_sg_list) + goto bail_qp; qp->allowed_ops = get_allowed_ops(init_attr->qp_type); RCU_INIT_POINTER(qp->next, NULL); @@ -1153,7 +1119,7 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, */ priv = rdi->driver_f.qp_priv_alloc(rdi, qp); if (IS_ERR(priv)) { - ret = priv; + ret = PTR_ERR(priv); goto bail_qp; } qp->priv = priv; @@ -1167,12 +1133,10 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, qp->r_rq.max_sge = init_attr->cap.max_recv_sge; sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) + sizeof(struct rvt_rwqe); - err = rvt_alloc_rq(&qp->r_rq, qp->r_rq.size * sz, + ret = rvt_alloc_rq(&qp->r_rq, qp->r_rq.size * sz, rdi->dparms.node, udata); - if (err) { - ret = ERR_PTR(err); + if (ret) goto bail_driver_priv; - } } /* @@ -1193,34 +1157,35 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, qp->s_max_sge = init_attr->cap.max_send_sge; if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR) qp->s_flags = RVT_S_SIGNAL_REQ_WR; - err = alloc_ud_wq_attr(qp, rdi->dparms.node); - if (err) { - ret = (ERR_PTR(err)); - goto bail_driver_priv; - } + ret = alloc_ud_wq_attr(qp, rdi->dparms.node); + if (ret) + goto bail_rq_rvt; + + if (init_attr->create_flags & IB_QP_CREATE_NETDEV_USE) + exclude_prefix = RVT_AIP_QP_PREFIX; - err = alloc_qpn(rdi, &rdi->qp_dev->qpn_table, + ret = alloc_qpn(rdi, &rdi->qp_dev->qpn_table, init_attr->qp_type, - init_attr->port_num); - if (err < 0) { - ret = ERR_PTR(err); + init_attr->port_num, + exclude_prefix); + if (ret < 0) goto bail_rq_wq; - } - qp->ibqp.qp_num = err; + + qp->ibqp.qp_num = ret; + if (init_attr->create_flags & IB_QP_CREATE_NETDEV_USE) + qp->ibqp.qp_num |= RVT_AIP_QP_BASE; qp->port_num = init_attr->port_num; rvt_init_qp(rdi, qp, init_attr->qp_type); if (rdi->driver_f.qp_priv_init) { - err = rdi->driver_f.qp_priv_init(rdi, qp, init_attr); - if (err) { - ret = ERR_PTR(err); + ret = rdi->driver_f.qp_priv_init(rdi, qp, init_attr); + if (ret) goto bail_rq_wq; - } } break; default: /* Don't support raw QPs */ - return ERR_PTR(-EINVAL); + return -EOPNOTSUPP; } init_attr->cap.max_inline_data = 0; @@ -1233,28 +1198,24 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, if (!qp->r_rq.wq) { __u64 offset = 0; - err = ib_copy_to_udata(udata, &offset, + ret = ib_copy_to_udata(udata, &offset, sizeof(offset)); - if (err) { - ret = ERR_PTR(err); + if (ret) goto bail_qpn; - } } else { u32 s = sizeof(struct rvt_rwq) + qp->r_rq.size * sz; qp->ip = rvt_create_mmap_info(rdi, s, udata, qp->r_rq.wq); - if (!qp->ip) { - ret = ERR_PTR(-ENOMEM); + if (IS_ERR(qp->ip)) { + ret = PTR_ERR(qp->ip); goto bail_qpn; } - err = ib_copy_to_udata(udata, &qp->ip->offset, + ret = ib_copy_to_udata(udata, &qp->ip->offset, sizeof(qp->ip->offset)); - if (err) { - ret = ERR_PTR(err); + if (ret) goto bail_ip; - } } qp->pid = current->pid; } @@ -1262,7 +1223,7 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, spin_lock(&rdi->n_qps_lock); if (rdi->n_qps_allocated == rdi->dparms.props.max_qp) { spin_unlock(&rdi->n_qps_lock); - ret = ERR_PTR(-ENOMEM); + ret = -ENOMEM; goto bail_ip; } @@ -1288,9 +1249,7 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, spin_unlock_irq(&rdi->pending_lock); } - ret = &qp->ibqp; - - return ret; + return 0; bail_ip: if (qp->ip) @@ -1300,19 +1259,18 @@ bail_qpn: rvt_free_qpn(&rdi->qp_dev->qpn_table, qp->ibqp.qp_num); bail_rq_wq: - rvt_free_rq(&qp->r_rq); free_ud_wq_attr(qp); +bail_rq_rvt: + rvt_free_rq(&qp->r_rq); + bail_driver_priv: rdi->driver_f.qp_priv_free(rdi, qp); bail_qp: kfree(qp->s_ack_queue); - kfree(qp); - -bail_swq: + kfree(qp->r_sg_list); vfree(swq); - return ret; } @@ -1455,6 +1413,9 @@ int rvt_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int pmtu = 0; /* for gcc warning only */ int opa_ah; + if (attr_mask & ~IB_QP_ATTR_STANDARD_BITS) + return -EOPNOTSUPP; + spin_lock_irq(&qp->r_lock); spin_lock(&qp->s_hlock); spin_lock(&qp->s_lock); @@ -1708,6 +1669,7 @@ inval: /** * rvt_destroy_qp - destroy a queue pair * @ibqp: the queue pair to destroy + * @udata: unused by the driver * * Note that this can be called while the QP is actively sending or * receiving! @@ -1738,11 +1700,11 @@ int rvt_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata) kvfree(qp->r_rq.kwq); rdi->driver_f.qp_priv_free(rdi, qp); kfree(qp->s_ack_queue); + kfree(qp->r_sg_list); rdma_destroy_ah_attr(&qp->remote_ah_attr); rdma_destroy_ah_attr(&qp->alt_ah_attr); free_ud_wq_attr(qp); vfree(qp->s_wq); - kfree(qp); return 0; } @@ -1809,7 +1771,7 @@ int rvt_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, } /** - * rvt_post_receive - post a receive on a QP + * rvt_post_recv - post a receive on a QP * @ibqp: the QP to post the receive on * @wr: the WR to post * @bad_wr: the first bad WR is put here @@ -1883,9 +1845,9 @@ int rvt_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr, /** * rvt_qp_valid_operation - validate post send wr request - * @qp - the qp - * @post-parms - the post send table for the driver - * @wr - the work request + * @qp: the qp + * @post_parms: the post send table for the driver + * @wr: the work request * * The routine validates the operation based on the * validation table an returns the length of the operation @@ -1995,6 +1957,7 @@ static inline int rvt_qp_is_avail( * rvt_post_one_wr - post one RC, UC, or UD send work request * @qp: the QP to post on * @wr: the work request to send + * @call_send: kick the send engine into gear */ static int rvt_post_one_wr(struct rvt_qp *qp, const struct ib_send_wr *wr, @@ -2231,7 +2194,7 @@ bail: } /** - * rvt_post_srq_receive - post a receive on a shared receive queue + * rvt_post_srq_recv - post a receive on a shared receive queue * @ibsrq: the SRQ to post the receive on * @wr: the list of work requests to post * @bad_wr: A pointer to the first WR to cause a problem is put here @@ -2351,31 +2314,6 @@ bad_lkey: } /** - * get_count - count numbers of request work queue entries - * in circular buffer - * @rq: data structure for request queue entry - * @tail: tail indices of the circular buffer - * @head: head indices of the circular buffer - * - * Return - total number of entries in the circular buffer - */ -static u32 get_count(struct rvt_rq *rq, u32 tail, u32 head) -{ - u32 count; - - count = head; - - if (count >= rq->size) - count = 0; - if (count < tail) - count += rq->size - tail; - else - count -= tail; - - return count; -} - -/** * get_rvt_head - get head indices of the circular buffer * @rq: data structure for request queue entry * @ip: the QP @@ -2449,7 +2387,7 @@ int rvt_get_rwqe(struct rvt_qp *qp, bool wr_id_only) if (kwq->count < RVT_RWQ_COUNT_THRESHOLD) { head = get_rvt_head(rq, ip); - kwq->count = get_count(rq, tail, head); + kwq->count = rvt_get_rq_count(rq, head, tail); } if (unlikely(kwq->count == 0)) { ret = 0; @@ -2484,7 +2422,9 @@ int rvt_get_rwqe(struct rvt_qp *qp, bool wr_id_only) * the number of remaining WQEs. */ if (kwq->count < srq->limit) { - kwq->count = get_count(rq, tail, get_rvt_head(rq, ip)); + kwq->count = + rvt_get_rq_count(rq, + get_rvt_head(rq, ip), tail); if (kwq->count < srq->limit) { struct ib_event ev; @@ -2506,7 +2446,7 @@ bail: EXPORT_SYMBOL(rvt_get_rwqe); /** - * qp_comm_est - handle trap with QP established + * rvt_comm_est - handle trap with QP established * @qp: the QP */ void rvt_comm_est(struct rvt_qp *qp) @@ -2617,7 +2557,7 @@ EXPORT_SYMBOL(rvt_stop_rc_timers); /** * rvt_stop_rnr_timer - stop an rnr timer - * @qp - the QP + * @qp: the QP * * stop an rnr timer and return if the timer * had been pending. @@ -2835,7 +2775,7 @@ void rvt_qp_iter(struct rvt_dev_info *rdi, EXPORT_SYMBOL(rvt_qp_iter); /* - * This should be called with s_lock held. + * This should be called with s_lock and r_lock held. */ void rvt_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, enum ib_wc_status status) @@ -2952,7 +2892,7 @@ static enum ib_wc_status loopback_qp_drop(struct rvt_ibport *rvp, } /** - * ruc_loopback - handle UC and RC loopback requests + * rvt_ruc_loopback - handle UC and RC loopback requests * @sqp: the sending QP * * This is called from rvt_do_send() to forward a WQE addressed to the same HFI @@ -3133,6 +3073,8 @@ do_write: case IB_WR_ATOMIC_FETCH_AND_ADD: if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) goto inv_err; + if (unlikely(wqe->atomic_wr.remote_addr & (sizeof(u64) - 1))) + goto inv_err; if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), wqe->atomic_wr.remote_addr, wqe->atomic_wr.rkey, @@ -3192,7 +3134,9 @@ send_comp: rvp->n_loop_pkts++; flush_send: sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; + spin_lock(&sqp->r_lock); rvt_send_complete(sqp, wqe, send_status); + spin_unlock(&sqp->r_lock); if (local_ops) { atomic_dec(&sqp->local_ops_pending); local_ops = 0; @@ -3246,9 +3190,15 @@ serr: spin_unlock_irqrestore(&qp->r_lock, flags); serr_no_r_lock: spin_lock_irqsave(&sqp->s_lock, flags); + spin_lock(&sqp->r_lock); rvt_send_complete(sqp, wqe, send_status); + spin_unlock(&sqp->r_lock); if (sqp->ibqp.qp_type == IB_QPT_RC) { - int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR); + int lastwqe; + + spin_lock(&sqp->r_lock); + lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR); + spin_unlock(&sqp->r_lock); sqp->s_flags &= ~RVT_S_BUSY; spin_unlock_irqrestore(&sqp->s_lock, flags); |